研究目的
To review the primary standard Free-air ionization chamber correction factor experimental method and Monte Carlo simulation method in the NIM and to obtain the correction factor for the medium-energy X-ray primary standard free-air ionization chamber at 100 kV, 135 kV, 180 kV, 250 kV four CCRI reference qualities.
研究成果
The study successfully calculates the correction factors for the medium-energy X-ray free-air ionization chamber using both experimental and Monte Carlo simulation methods. The results are in good agreement with previous studies, demonstrating the reliability of the methods used. The correction factors and their associated uncertainties are provided, offering theoretical and data support for air-kerma international comparisons.
研究不足
The study acknowledges the influence of air density changes due to humidity on the air-kerma measurements and the potential for field distortion within the ionization chamber, which are corrected using international recommendations and experimental results, respectively.
1：Experimental Design and Method Selection:
The study employs both experimental measurement and Monte Carlo simulation methods to calculate correction factors for the free-air ionization chamber.
2：Sample Selection and Data Sources:
The study uses the NIM-designed Free-air ionization chamber for measuring 60 keV to 250 keV X-rays.
3：List of Experimental Equipment and Materials:
The main characteristics of the NIM free-air ionization chamber, including the measuring volume and the polarizing voltage, are detailed.
4：Experimental Procedures and Operational Workflow:
The study describes the measurement of ionization current under different saturation voltages, the calculation of air attenuation correction factor, wall transmission correction factor, polarity correction factor, and the use of Monte Carlo simulation for electron loss, scattered radiation, fluorescence, and diaphragm correction factors.
5：Data Analysis Methods:
The study uses linear fitting functions for initial and volume recombination calculations and the EGSnrc program for Monte Carlo simulations.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
